The Cuyo is a region in the west of Argentina bordered in the north and northeast by the Andean Northwest region, in the east and southeast by the Pampas region, in the south by the Patagonia region, and in the west by Chile.

The Andean Northwest is a region in the northwest of Argentina bordered in the north by Bolivia, in the east by the Chaco region, in the southeast by the Pampas region, in the south by the Cuyo region, and in the west by Chile.

Mesopotamia is a region in the northeast of Argentina bordered to the north by Paraguay, to the east by Brazil and Uruguay, to the south and west by the Pampas region, and in the northwest by the Chaco region.